The object's mass. Weight would be how gravity affected it, size is how large it is, density is how tightly the molecules are to each other. Mass is how much matter is in the object.
That's how the food chain works. There isn't much to it.
Answer:
C.
Explanation:
A. This makes no sense because the chart is only about the number of fish not about the number of plants that have grown
B. Makes no sense???
C. This is correct because it provides a reason why the number of fish in the stream next to the orchard have decreased
D. Makes no sense as well